LinkedIn’s apparently delighted workforce may still be under the influence of post-IPO euphoria. The career-building site went public in 2011 and has been growing rapidly since, now counting some 277 million members around the world. And then there are the corporate perks: free yoga class, education stipends, biweekly all-hands meetings with Weiner, and more.

“Best company I’ve ever worked for,” a Chicago-based account executive for LinkedIn recently wrote on Glassdoor.com. As for cons? “Can’t think of anything,” the employee wrote. Other workers wrote that the company can be “[p]retty intense at times” and is “overrun” by consultants.

Similarly, Mulally has presided over a return to post-recession profitability for the American automaker. He openly flirted with vying for the top spot at Microsoft Corp. late last year.

Zuckerberg, meanwhile, is riding high on his $19 billion acquisition of the messaging service WhatsApp, but his rating slipped over the past year, according to the survey, from 99% to 93%. That “wobble” is the result of employees who “cite the slow creep of bureaucracy” inside the social network’s headquarters, said Glassdoor CEO Robert Hohman.

(Hohman declared himself ineligible for the ranking, though he has a 99% approval rating according to the site, he said.)

Beloved as they may be, these leaders likely know better than to take their high approval ratings for granted. LinkedIn, for example, reported slowing growth in its latest earnings and faces obstacles in its recent attempt to expand in China, while Starbucks must work to expand its digital footprint as consumers shift away from malls and onto the web.

Glassdoor’s ranking methodology is admittedly unscientific. The site compiled its rankings by scraping the opinions of employees who elected to log on to the site and review their companies, so it’s not a random sample. Only reviews written in the past 12 months were considered, and only companies that had accumulated at least 100 CEO approval ratings—several hundred in all, according to Glassdoor—were included in the ranking.

Companies “suspected of any suspicious activity”—i.e. planting false glowing reviews—would have been excluded, but that didn’t happen this year, a Glassdoor spokesman said.

Below are the approval ratings of the 10 best CEOs of companies with more than 1,000 employees, according to Glassdoor.com:

Other well-known CEOs didn’t crack the top 50. Mike Jeffries of Abercrombie & Fitch, for example, suffers from a 25% approval rating among his own employees, according to Glassdoor. Jeffries was recently stripped of his chairman title amid weak sales at the clothing retailer.

And ex-Microsoft CEO Steve Ballmer, who exited his post in February, only managed a 39% approval rating, well below the average of 69%. His replacement, Satya Nadella, will make his debut on the list next year—if his employees approve.

About At Work

Written and edited by The Wall Street Journal’s Management & Careers group, At Work covers life on the job, from getting ahead to managing staff to finding passion and purpose in the office. Tips, questions? email us.